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Pronunciation Guide
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At their most basic, a sealed tube allows a fan to make a vacuum.
When a canister pops into place, a fan whirs to life and creates a difference in air pressure that sucks the tube to its destination.
As early as the 1850s, people adapted artificial vacuums for powering the mail system, and they sent lots of packages — including cats.
Listen to native speakers pronounce “whirs” in real conversational contexts with synchronized timestamps and subtitles.